Darwin's theory. In 1859, Charles Darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. He defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".
The structure<span> and </span>function relate<span> because what the </span>structure<span> is made of influences what the ... Therefore, it is fit to </span>do<span> the job of pumping blood around the body.</span>
Endocytosis is when a a cell engulfs material into the cell and exocytosis a form of waste where the cell gets rid of materials.
One redo our could be a body of water like a dam as such, and another is something like a retention pond, taking in water
<span>Vitamin D.
Vitamin D is made from 7-dehydrocholesterol and needs UV light in order to be activated. Because the children are not exposed to sunlight, they are receiving insufficient UV light.</span>
